#include<bits/stdc++.h>
using namespace std;
int a[10010],b[10010];
int main(){
    int n;
    cin>>n;
    for(int i = 1;i<=n;i++) cin >> b[i];
    for(int i = 2;i<=n;i++){
        a[abs(b[i] - b[i-1])]++;
    }
    for(int i = 1;i<=n-1;i++){
        if(a[i] == 0){
            cout << "Not jolly"<<endl;
            return 0;
        }
    }
    cout <<"Jolly"<<endl;
}